Electric Solenoids Force stroke -1
Electric Rotary Actuator (solenoid)
Electric Rotary Actuators (motors) DC motors AC motors –stepper (2-phase synchronous) –brushless (3-phase synchronous) –induction
Step Motors
Step Motor 12 step/rev, 1 phase on
Step Motor 12 step/rev, 2 phase on
Step Motor 12 step/rev, half-stepping
Step Motors
Selecting Step Motors Torque Speed Current Lead configuration
Torque/Speed
Series/Parallel Wiring
Step Motor Drives Resolution (full, half, microstepping) Current Limit (resistor or digital) AC powered or DC powered Pulse/Direction or Indexing
Resolution Full step/Half step Microstepping –x2,x4,x5,x8,x10,x16,x25,x32,x50,x64,x125,x128,x 250,x256 common choices Max step frequency –PLC: 7kHz pulse rate => 2100 RPM at x1, 8.2RPM at x256 (1.8deg motor) –Compumotor 6104: 2MHz pulse rate => 2300RPM at x256 Resonance problems